coin bottle opener / Flaschenöffner

there are 2 different bottle opener:

"bottle opener normal":
you can print it with 100% infill or you can do this: print the first 3 mm and the last 3 mm without bottom layers and top layers (bottom layers=0). Choose 30% honeycomb infill.
For the 4 mm in the middle of the bottle opener you choose 100% infill. If you do so, you have a nice looking honeycomb look with a strengh core inside.

"bottle opener with holes":
this should be printed only with 100% infill.
If you are interested: this structure is the result of a weight-optimization using FEM :)

use a coin for the gap. I used a 10 Cent (Euro) coin.
It is not so easy to fit the coin in, so it needs some force. Depending on how tight your printer prints the gap, you can use a different kind of coin, of course.